P0171 Lean code - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 4 (permalink) Old 11-24-2015, 10:54 AM Thread Starter
Join Date: Nov 2015
Posts: 1
P0171 Lean code

I have a 2006 Cobalt SS/SC with the following mods:
ZZP midlength header/downpipe combo
3" pulley
60# injectors
1 step colder NGK
ZZP tune

So basically Stage II. After the install everything was good and running great. 1 week later I got the CEL which was of course for lean condition. When I bought the car it had the 3" pulley already but was running on stock injectors which you think would have made it very lean but never had CEL. I contacted ZZP to see if it could possibly be something in the tune but they said check for vaccum leaks. So im going to have a smoke test done next week but was trying to see who else has had this issue with a ZZP tune as well. No real change in the way the car is running and mpg has not really changed. I dont have the funds for a wideband to monitor the AFR but i am absolutlely going to get one soon. Any help is appreciated.
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post #2 of 4 (permalink) Old 01-04-2016, 03:53 PM
Join Date: Nov 2013
Posts: 4
Dang man I'm in the same boat. I just threw the p0171 code today it's been like 60 miles since I did the stage 3. Grrrr. I had a CAI and exhaust with stock tune and it had a lean code and MAF code for a while. But now with the tune im kinda upset that the CEL comes on...
Please post if you come across any solution, and I shall do the same. Best of luck
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post #3 of 4 (permalink) Old 01-10-2016, 03:16 PM

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Join Date: Mar 2010
Location: Ventura County, CA.
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Check for VAC leaks or boost leaks.

2009 Imperial Blue Metallic Cobalt SS/TC Sedan - "Stock":
2008 Victory Red HHR SS - Stock
2005 Chili Pepper Red Ion Redline - Stock
2007 Sunburst Orange Metallic LS Coupe - Sold
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post #4 of 4 (permalink) Old 01-12-2016, 12:19 PM
Join Date: Jan 2016
Posts: 1

Same thing here, on my friend's 05 SS/SC we put a ZZP Stage3 on in November he still has the P0171 and my bone stock 07 SS/SC just popped one Saturday.
Anyone had a fix yet?
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